Hydrology 



The science dealing with water and snow, including their 

 properties and distribution. 



Hydromorphic 



(1) Refers to soil occurring in poorly drained depressions 

 in humid regions, cf. Halomorphic. (2) Refers to cellular 

 features typical of Hydrophytes. 



Hydrophilous 



Refers to a plant that grows well in water or wet land. 



Hydrophyte 



A plant which grows wholly or partly immersed in water, 

 cf. Hygrophilous, Xerophilous, Mesophyte. 



Hydroponics 



The growing of plants so that the roots are immersed 

 in a water solution of nutrient salts or in some inert mate- 

 rial such as vermiculite which is supplied with a nutrient 

 solution. 



Hydrosere 



A collective term which includes all the stages in a 

 Succession beginning in water, cf. Hydrarch, Xerarch, Sere. 



Hydrosphere 



The parts of the earth covered with water, including 

 streams, lakes, oceans, cf. Lithosphere, Biosphere. 



Hydrotropism 



A growth response of plants to water as a stimulus. 



Hyetograph 



A form of self-recording Rain gage. 



Hygric 



Refers to a wet or moist condition of a habitat, cf. 

 Hygrophilous, Xerophilous. 



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